Description:1 The protective pad needs to be used with the mask. When using a mask, it can be placed in a mask, which will increase the life of the mask and alleviate the shortage of masks;2 Multi-layer protection, effectively blocking dust, haze and viruses;3 Scope of application: dust masks, self-use masks, beauty salons, pet shop masks, factory masks, food processing masks, environmental protection cleaning masks, etc.